hi guys i have a 2001 x5 thats got a annoying creaking sound all round.

if i place my foot on the break then very slowly creep forward or back theres creaking comming from all 4 brakes anyone have any ideas what it might be.

i have checked the fluid level and that seems ok.

the noise seems to be comming from the 2 front discs and the 2 rear drum all round?

i took a video in dark, you can hear the sound.
http://youtu.be/FPEJTD_cutI

anyone have any ideas what it might be.